Does anyone know where to find good, free sci-fi art on the internet? Especially the retro stuff, such as good scans of book covers from way back when, such as the 50's through the very early 80's? Good artwork can really set the tone of a game. But most free modern sci-fi art is Star Wars or Star Trek, or whatever happens to be popular on the Sci-Fi Channel.

I looked through the sites and found them all cool. The http://www.darkroastedblend.com/2007/11/retro-future-to-stars.html site is exactly what I was looking for. I also enjoyed the site about corporations' visions of how we all would be living in the future. I just don't see any modern equivalents to that: nobody wants to speculate about the bright, shiny future we could possibly be living in, eventually, and following it up with cool artwork, anymore. Of course, any bright future most probably will have its dark side ;-)